Debugger won't prettify source

I’m doing some work reverse engineering website JavaScript, and I’ve found that Firefox (68.9.0esr) won’t prettify some sources. In most cases the “{}” button is available, but sometimes it isn’t and I have to use another tool to prettify the file. Is this possibly due to the file being large, or does Firefox think it wasn’t minified and is refusing to prettify it for that reason? Not being able to step through prettified source files in the debugger is making my job quite a bit harder.

Pretty-print detection as known bugs that we are having high in the backlog.

The workaround is right-clicking the source tab and “Pretty print source” there.

Oh thanks, I missed that menu option. I also was able to get it to format using the “Jump to original location” menu option, although that was a bit finicky.